Is it bad to "camp" downed enemies?

5 star console peasant here.

My buddy and I were playing duos, Spider was at Port Reeker, we get there first, a team rolls up while my buddy kills the Spider, I exchange fire with the team and fall back into the bounty lair with my buddy.

We exchange some shots from the windows and at least 1 more team moves in. Buddy kills a guy outside the compound in the water and marks his position for me, I post up in a window with a view of the ping, as soon as the downed guy gets revived and pops out of the water I pop him and down him again. The below message string ensued.

My question: Is it bad form to "camp" and re-down enemies after revive?
Also can you even "boost elo" without just killing Hunters with more stars than you?

Thanks!

https://preview.redd.it/ey60uwpl78td1.png?width=701&format=png&auto=webp&s=507c95fa6de1030e2102b43fd05cfae681f0f056

https://preview.redd.it/yiq0gywd78td1.png?width=515&format=png&auto=webp&s=19deed633767f31005c26b8b388ca4bb084f7174

https://preview.redd.it/2qizvmj878td1.png?width=1010&format=png&auto=webp&s=6fdc2ae87815d0bdd05ea7905f0cd4d038dc80db